1747-6.22, Backup Scanner User Manual
1747-6.22, Backup Scanner User Manual
1747-6.22, Backup Scanner User Manual
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Overview<br />
This chapter contains the following information:<br />
• system overview<br />
• how the scanner interacts with the SLC processor<br />
• how the scanner interacts with adapter modules<br />
• scanner I/O image concepts<br />
• extended node capability<br />
• complementary I/O<br />
• scanner features<br />
• compatible network devices<br />
• backup concepts for the SLC-500 system<br />
Chapter 1<br />
System Overview The <strong>1747</strong>-BSN <strong>Backup</strong> <strong>Scanner</strong> provides redundancy for:<br />
• Remote I/O (RIO)<br />
• RS232 channel switchover for communications to devices such<br />
as operator interface<br />
• DH+<br />
The backup scanner also provides a High Speed Serial Link (HSSL)<br />
to write any retentative data from a primary to a secondary processor.<br />
In addition, the module has a Local Serial Link (LSL) to pass status<br />
information between multiple BSN modules located in the same<br />
chassis (optional).<br />
The <strong>1747</strong>-BSN is a complementary set of modules, with one module<br />
residing in the primary system and another module in the secondary<br />
or backup system. The primary module controls the operation of<br />
remote I/O, while the secondary module is available to take over<br />
control in the event of a fault in the primary.<br />
The backup scanner has the capability to switch between two<br />
communication channels. The first channel is configurable as RIO or<br />
DH+. The second channel is used to switch the RS232/485 channel in<br />
order to provide connection for electronic operator interfaces.<br />
The Remote I/O (RIO) scanner, Catalog Number <strong>1747</strong>-SN, is the<br />
remote I/O scanner for the SLC 500. It enables communication<br />
between an SLC processor (SLC 5/02 or later) and remotely located<br />
(3,048 meters [10,000 feet] maximum) 1746 I/O chassis and other<br />
RIO-compatible Allen-Bradley operator interface and control<br />
devices. The <strong>1747</strong>-SN scanner communicates with remotely located<br />
devices using the A-B Remote I/O link. The RIO link consists of a<br />
single master (scanner) and multiple slaves (adapters).<br />
Publication <strong>1747</strong>-<strong>6.22</strong>